Lockseamer for corrugated radiator core blanks



May 19, 1953 A. G. voGT LOCKSEAMER FOR CORRUGATED RADIATOR CORE BLANKS Filed July 3, 1948 2 Sheets-Sheet 2 JV. Lm,

ATTY

Patented May 19, 1953 LOCKSEAMER FOR CORRUGATED RADIATOR CORE BLANKS Arthur G. vogav Toledo, ohio Application July 3, 1948, Serial No. 36,992

Claims. ('Cl. 113-54) Y chines for radiator core units so that the seamed ends of the units are substantially symmetrical at each corner, thereby to enable adjacent units to nest more closely together and to facilitate and make more uniform the subsequent sealing of the several core units.

`Other objects and advantages of the invention will hereinafter appear,- and for purposes of illustration but not of limitation, an embodiment of the invention is shown on the accompanying drawings, in which Figure 1 is a top plan view of a lockseaming machine, a portion of the reciprocatory ram being broken away for purposes of clarity, and the ram actuating mechanism being removed;

Figure 2 is a bottom plan View of the lockseaming die members, the rear portion 'of the supporting ram therefor being broken away;

Figure 3 is a side perspective view of the stationary longitudinally fluted arm showing a pair of core blanks mounted in position preparatory to lockseaming operation;

Figure 4 is a fragmentary side elevation of the arm shown in Figure 3, and showing particularly the ridged block;

Figure 5 is a transverse sectional view on the line 5--5 of Figure 4;

Figure 6 is a side elevation oi that portion of the machine shown on Figure l, but showing the ram in position preparatory to the lockseaming operation;

Figure 7 is an enlarged transverse sectional view substantially on the line l-l of Figure G;

Figure 8 is a view similar to Figure "I, but showing the seaming dies advanced to effect a partial seaming of the radiator core strips or blanks;

Figure 9 is a transverse sectional View showing the lockseam completed and being ilattened or ironed out; and

Figure 10 is a transverse sectional View showing a pair of lockseamed core units in nested relation.

The illustrated embodiment of the invention comprises a vertically disposed bracket lll (Fig ure 6) which has a table-like top II of substantially rectangular form and pivotally mounted on f pins I2 are horizontally disposed arms I3 and I4 which are similar to each other. The arms I3 and I4 are elongate and are pivotally mounted approximately centrally thereof. At the rear end of each of these arms is an inwardly extending bracket I5-on'which a roller I6 is mounted for rotation about the vertical axis. The rollers It engage opposite sides of a longitudinally reciprocatory ram I1 which has a pair of oppositely disposed inwardly relieved surfaces I8. Suitably secured to the table II and extending upwardly therefrom is a support I9 for a horizontally disposed guide bar 2D which assists in guiding the reciprocatory movement'of the 'ram I1.

Mounted on the top of the table .I I in laterally spaced relation is a pair of arms 2| and 22 which project a'substantial distance forwardly of the table I I and are pivoted attheir rear ends on pins 23 to the table. On the inner side of each of the arms 2l and 22, approximately midway of their length, are sockets 24 to receive the ends of a helically coiled spring 25 which tends to urge the arms 2| and 22 away from each other. On the forward `end of each of the arms I3 and I4 is a set screw 26 which is adapted to be secured in adjusted position by a lock nut 21. It will be apparent that the coil spring 25 not only urges the arms 2I and 22 away from each other, but also through the set screws 2B, yieldingly hold the rollers I6 in engagement with the sides of the ram I'I. When the rollers I6 enter the relieved or depressedsurfaces I8, the coil spring 25 separates the arms 2| and 22 sufficiently to enable the radiator core blanks to be inserted for the lockseaming operation, and also to enable the seamed unit to be removed as will hereinafter appear.

Rigidly mounted on the table II between the arms 2| and 22 is an arm 28 which is held in place by a pair of screws 29. As shown, the arm Z 'is of approximately the same length as the arms 2| and 22 and the outer end portion of the arm 28 is of reduced thickness, particularly as shown in Figure 3. An enlarged opening 25a extending transversely through the central portion of the arm 28, accommodates the coil spring 25 which extends therethrough. Formed on the outer portion of the reduced end of the arm 28,

of the arm; that is, a ridge 3l on one side of the Carriedlat the forward -end of theram'I'I isI aplurality of die members which are adapted toI lockseam the core blanks during the advancingv The members consist,

movement of the ram I1.

of a pair of substantially L-shaped diefmembers 33 and 34 which :are secured respectively to opposite sides of the forward end of the --ramfI'If and a die member` 35 which hasfa triangularly disposed portion 35 which forms with the adjacent portions of the die members 33 and-f34i the entering surfaces for the core blanks respectively.' The die 'mem-ber 34;' carries `Aa. presser plate B'iwhich projects rearwardly` ofpthe diemembers 33 and 34 to iron outvor-pressfthefseamff atly into position'aswill'hereinaiter-befde-f The detail construction of these diei;fmernbers forms no part of the present inve-ration, lock-r seaming dies ofvthis character being 4old inthe-- art.v Suince it to say that two coreblanksareplaced in the machinesubstantially-as shown in Figure 7, with their adjacent endsedisposed'in Iwith respect to the arm:22,forforwardly and outthe path of travel ofthe'y ramsl'ii, so that as thel ram I1 advanced-'the ends'are progressively bent` into lockseaminggrelation, and subsequently flat-- tened Vand ironed out-by' the ironing die iB'Ifias shown in Figures 7 to 9, thewbianks; such `-asA and Bybeing gripped by the pivotedi-arms: I3 and I4 against the stationary arm 23 due tothe roeking movement of the arms I3fand aIlI afterthef rollers I6 f leave the relieved surfacesalsf The blanks A .and B, particularly -as showngin Figure Y 3, are formed with a seriesfof lateral-1y' extending corrugaticns, the lcorrugations being .suchfas'to t the .ridgesI and grooves of the pivotedfarmsr I3:

and I4 (Figure 7).

Centrally oreach core blankzisformed a series of outwardly extending substantially'pyramidal portions Cfandion rthe advancededge portion of each blankis a'series :of .outwardlyextending substantially triangular box-like 'embossureslar-,

ranged in series which 'openoutward'ly towardthe side.

blank cooperate with the other in forming aifradi-` At the opposite end are' also -embossures1 Earranged in seriespit beingunderstoodtl'iatA the Vseries of embossures or proiectionsoi 'eachn ator core `unit which .when 'nestedwithothers and properly sealed as by soldering, form^therY radiator core structure.`

One difficulty which has heretoforebeen vex--v perienced in machines of this character isinthe deformed during the lockseaining opera-tionfand;

this difculty is not infrequentlyencountered.v

In order toobviatethat diiiiculty,-a-pair ofinf serts 33 is mounted'on opposite sidesof'thei stationary arm 28 andinthis instance are-held 'ina Each ofA the-inserts is formed with a series of alternating \/,sl-1aperdv ridges 49 `and grooves 4I* of a coniigurationporf-V l place by pins or rivets 39.1

responding to the triangular box-.likeprojections:.-u Dso that ,the latter may t--overr the Vrespective.75.

ridges which ll and support them during the lockseaming operation. To insurethe proper position of the blanks, and particularly the boxlike end portions D on the inserts, a stop pin 42 passes through the arm 28 and the inserts 38 and projects beyond the sides thereof a sufcient distance to engage the edges or" the respective blanks A and B. The ends of the pin 42 serve as a stop and it issu-positioned that the box-like portions D-"will havemsuiciently-tted over the inserts adequately to support and obviate possible damage to them.

AnotherY--diiiiculty encountered in connection withfthelflockseaming operation is with respect to the outwardly extending corner portion as, for example, thecorner portion 43, indicated in Figur.e., 9.-l Ordinarilyf4 in the bending of the blanks; during the lockseaming operation and the subsequent -ironing of the seam within the longitudinal grooves 39, the portion oi the metal in the region ofthe :bend 23 becomes displaced or deformed to such an extent astomilitate against the properjoining of adjacent core units. To obviate this difficulty, a relatively small L-shaped studs 5I- secured to the upper4 side of the lpivoted arm 22 serve to guide the movement oi the slide 49;. Such movement is rearwardly and inwardly wardly. v For actuating the slide 49 'is a link 52,A

the rear end oi which is connected to an end portion of an arm 53 which is-centrally pivoted-on a pin .54 on the pivoted arm 22.- On-the'oppo Y*site end of the arm 53 is Van,upstanding pin55.`A

The pin 55 when inoperative rides along `a longitudinal groove or recess 56 formed inthe ram I'I.' However, in operative position, the pin 55 engages in-'a notch5'l provided at the advanced` fiend of the longitudinal recess 56.

In operation, when the ram I'i moves vforwardly to eect the lockseaming operation, the pin 55 is engaged by a wal-lof the notch 5'?- androcks the arm 53 to the dotted line position shown in Figure -lvl, thereby retracting the slide t9 and moving the linger 48 Linto the position shown on Figure 3,

thusto support the .portion lltiliigure 9) It'willv be observed that the ringer `has'its outer side inclining to correspond to lthe'inclination of the blank A in that-regionand the top oi' the ringerl 43 `is iiat. The nger remains in that position during the lockseaming operation as well as the final ironing stepfso that the proper angularity of the blankA, asv at 43, is retained.

49 Ais shifted forwardly and outwardly away from tion until thenext succeeding advancing stroke of the ram,

It is to be Iunderstood that numerous changes in details of construction, arrangement and roperation may be effected Without departing from the spiritof the invention especially as defined in the appended claims.

Whatl claim is:

1. En a .lockseamer machine for transversely corrugated radiator core blanks,` blank folding die members, a reciprocable Vrain for carrying.

said blank folding die members, a pair of levers ,.intermediately, pivoted and actuated by said ram 'foreiecting clamp-ing movement thereof, a centrally disposed rigid arm-and a pivoted springtensioned blank ciamping arm on each side of said rigid arm movable by the adj acent'lever, out- '.Wardly extending corrugated .members .on oppo- When the ram Il retracts, it will be manifest: that the slide site sides of said rigid arm against which the end portions of the blank t, said members having corrugations corresponding to the adjacent portions of the blanks to be seamed, and stop means for positioning the blanks associated with said members.

2. The organization as claimed in claim 1, in

v which the outwardly extending corrugated members constitute separate parts and in which the stop means comprises a pin projecting through the corrugated members and the rigid arm with a portion beyond opposite sides of the members.

3. The organization as claimed in claim 1, in which the radiator core blanks to be lockseamed are formed with a lseries of outwardly extending triangular box-like projections and the outwardly extending corrugated members are of such configuration as to fit within such triangular boxlike projections to sustain the shape thereof during the lockseaming operation.

ARTHUR G. VGGT.

References Cited in the le of this patent UNITED STATES PATENTS Number Name n Date 925,445 .Beebe June 22, 1903` 1,325,210 Schroeder Dec. 16, 1919 Habil Mar. 25, 1930 

